EP0273757B1 - Bildlesegerät - Google Patents

Bildlesegerät Download PDF

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Publication number
EP0273757B1
EP0273757B1 EP87311491A EP87311491A EP0273757B1 EP 0273757 B1 EP0273757 B1 EP 0273757B1 EP 87311491 A EP87311491 A EP 87311491A EP 87311491 A EP87311491 A EP 87311491A EP 0273757 B1 EP0273757 B1 EP 0273757B1
Authority
EP
European Patent Office
Prior art keywords
light
light source
image
image carrier
board
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP87311491A
Other languages
English (en)
French (fr)
Other versions
EP0273757A2 (de
EP0273757A3 (en
Inventor
Fumikazu Nagano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Publication of EP0273757A2 publication Critical patent/EP0273757A2/de
Publication of EP0273757A3 publication Critical patent/EP0273757A3/en
Application granted granted Critical
Publication of EP0273757B1 publication Critical patent/EP0273757B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/40056—Circuits for driving or energising particular reading heads or original illumination means

Definitions

  • the present invention relates to an image reading apparatus and more particularly, to an image reading apparatus such as a color copier and a color scanner used to read a transparent film.
  • apparatus for reading an image carried on a light transmissive film wherein light from a light source is directed onto the image carrier, the light transmitted through the image-carrier being detected in order to derive a representation of the image, characterised by means for controlling the intensity of the light source in accordance with the determined transmissivity of the image carrier.
  • Power sources 14R, 14G, and 14B which individually emit red, green and blue light respectively (when 14R, 14G, anf 14B are generically referred, shown as 14) are provided below the board 13. Light from the light source 14 irradiates the film 11 through the board 13.
  • the light source 14 has a length corresponding to the width of the board 13 and is a linear light source, preferably a fluorescent lamp.
  • a first red light source 14R is switched on and the red light passing through the board 13 is diffused and uniformly radiated within the first adjusting board 12a to pass through the left side C of the first adjusting board 12a.
  • the board 13 moves in the direction of arrow c (to the left) in FIG. 1 from the point C as a base point.
  • the red light from the red light source 14R scans the first adjusting board to its right side D, and after that, scans the film 11 from its left side E to its right side F. After the red light source 14 R reaches the right side F, it is switched off. At the same time, the board 13 moves in the direction of arrow d (to the right) in FIG. 1 back to the base point C.
  • the green light source 14 G is switched on and scans in the same way as the red light source, and at last the blue light source 14B is switched on and scans in the same way, to finalize the scan of the film 11 by all of the light sources 14R, 14G, and 14B.
  • the light from the light source 14 first passes through the first adjusting board 12a and as shown by line m1, reaches a reflection mirror 16. As shown by line m2, it is reflected and passes through the lens 17 to be introduced to an imaging means 18, preferably charge-coupled device (CCD). Then, successively and sequentially, the light passing through the film 11 on the second adjusting board 12b is introduced in the same way as shown by lines m1 and m2. In this way, first, information regarding the white balance from the first adjusting board 12a is introduced to line n1 after converted to corresponding electrical signals, and then, information regarding the color and tone of the film 11 on the second adjusting board 12b is introduced to the line n1 after converted to the corresponding electrical signal. According to the abovementioned electrical signals, controlling is made as described below, and then, the image is processed by an image processing apparatus(not shown in the figures).
  • an image processing apparatus not shown in the figures.
  • the light from the light source 14 is reflected only once by the reflection mirror 16, but the reflection may not be restricted to be only once, and it may be possible to use several reflection mirrors to lead the light in a desired direction. Also, a lens 17 provided on the optical path may not be restricted to be only at one place.
  • light source is a linear light source, but surface light source and imaging means for surface-reading may be used to avoid moving the above board 13.
  • FIG. 2 is a block diagram showing an electrical constitution of an image reading apparatus as a preferred embodiment of the present invention.
  • the board 13 and the lens 17 are omitted and light reflection is made only once by the reflection mirror 16.
  • the output of the imaging means 18 is amplified by an amplifier 19 and is inputted to a comparator 20 as a comparison means used to detect and compare the output of the imaging means 18 with a predetermined level.
  • the controlling portion 21 as a controlling means which outputs power controlling signals sequentially inputs pulse controlling signals to the power source 22 which energizes the light source by power source controlling signals so that the light amount of the light source 14 is adjusted.
  • the controlling signals are determined by the abovementioned output level of the comparator 20 '0' or '1'.
  • controlling portion 21 gives the controlling signal Pw to the power source 22.
  • Pw is formulated as follows:
  • the light emitted from the light source 14R passes through the first adjusting board 12a and reaches the reflection mirror 16 as shown by line m1, and then is reflected and introduced to the imaging means 18 as shown by line m2.
  • the imaging means 18 corresponds to the 'white' portion of the film, which means the condition of white balance. If, in this condition, the output level of the comparator 20 is logic '0,' the output level is too low, so the controlling portion 21 increases the level of the controlling signal Pw to the power source 22 so that the following relation is satisfied.
  • the first adjusting board have a good transmission factor and, for example, the output level of the comparator 20 is logic '1' at the level (1/2), a quantity between 1/2 and 1/16 is sequentially subtracted until the output level of the comparator 20 becomes logic '0.
  • the output level becomes '0' after the subtraction is executed five times:
  • the red light source 14R then scans the film 11 on the second adjusting board 12b from its left side E. After reading the red part of the film 11 to the right side F, the red light source 14R is switched off and at the same time, the board not shown in the figures goes in the direction of arrow d (to the right in FIG. 2) back to the base point C, the left side of the first adjusting board 12a. Then, the green light source 14G is switched on. The green light source 14G executes white balance adjustment and scanning of film 11 in the same way as the red light source 14R does. Then, the blue light source 14B is switched on and executes the same action. The reading of the film 11 by the three primary color lights 14R, 14G, and 14B is thus completed.
  • the film to be read is a color positive film, but the present invention can also be applied to a negative film.
  • white balance adjustment may be done regarding only the first color (for example, red) light.
  • any control for example, manual keyboard or switch means may be provided for presenting information of the light transmission factor of the film into the control means.

Claims (6)

1. Vorrichtung zum Lesen eines auf einem lichtdurchlässigen Film (11) vorhandenen Bildes, bei der Licht von einer Lichtquelle (14) auf den Bildträger gerichtet und das durch den Bildträger hindurchtretende Licht zur Erzeugung einer Widergabe des Bildes erfaßt wird, gekennzeichnet durch eine Einrichtung (21) zur Steuerung der Intensität der Lichtquelle in Abhängigkeit von der ermittelten Durchlässigkeit des Bildträgers.
2. Vorrichtung nach Anspruch 1, gekennzeichnet durch eine Einrichtung (12a) zur Erzeugung einer Darstellung des Lichtübertragungsfaktors des Bildträgers, wobei die Steuereinrichtung auf das von der Einrichtung zur Darstellung abgeleitete Informationssignal anspricht.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Darstellungseinrichtung ein aus einer Mehrzahl von austauschbaren lichtdurchlässigen Platten (12a) mit jeweils verschiedenen Lichttransmissionsfaktoren ausgewähltes Exemplar aufweist, welches gewählt wird, daß der Lichttransmissionsfaktor dem des Bildträgers (11) entspricht, wobei die entsprechende Information durch Vergleich des Betrages der Lichtransmission durch die ausgewählte Platte mit einem Bezugswert erhalten wird.
4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Steuereinrichtung manuell bedienbar ist.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Steuereinrichtung ein Tastenfeld oder Schalteinrichtung aufweist.
6. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Steuereinrichtung zur Steuerung der Intensität der Lichtquelle so betreibbar ist, daß der Betrag des durch den Bildträger hindurchtretenden Lichtes zur Kompensation des Lichtübertragungsfaktors des Bildträgers geeignet ist.
EP87311491A 1986-12-27 1987-12-29 Bildlesegerät Expired EP0273757B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP311207/86 1986-12-27
JP61311207A JPS63166355A (ja) 1986-12-27 1986-12-27 読取り装置

Publications (3)

Publication Number Publication Date
EP0273757A2 EP0273757A2 (de) 1988-07-06
EP0273757A3 EP0273757A3 (en) 1988-10-05
EP0273757B1 true EP0273757B1 (de) 1990-12-12

Family

ID=18014391

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87311491A Expired EP0273757B1 (de) 1986-12-27 1987-12-29 Bildlesegerät

Country Status (5)

Country Link
US (1) US4845531A (de)
EP (1) EP0273757B1 (de)
JP (1) JPS63166355A (de)
CA (1) CA1328011C (de)
DE (1) DE3766697D1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5218402A (en) * 1991-09-17 1993-06-08 Eastman Kodak Company Color image reproduction with compensating light source
US5269871A (en) * 1991-10-28 1993-12-14 Minnesota Mining And Manufacturing Company Tape applying device
JPH0641478U (ja) * 1992-11-20 1994-06-03 ダイワ精工株式会社 魚釣用両軸受型リ−ルの制動装置
DE19731531B4 (de) * 1997-07-23 2006-02-16 Bts Holding International Bv Infrarotabtastung von Perforationslöchern

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2816325A1 (de) * 1978-04-14 1979-10-18 Computer Ges Konstanz Einrichtung zum abtasten von mustern mit einer geregelten lichtquelle
JPH0618418B2 (ja) * 1984-04-11 1994-03-09 シャープ株式会社 読取装置
JPS60216667A (ja) * 1984-04-11 1985-10-30 Sharp Corp 画像読取装置のｃｃｄセンサ出力回路
JPS613133A (ja) * 1984-06-15 1986-01-09 Fuji Photo Film Co Ltd 写真焼付機及びその焼付露光量決定方法
US4647961A (en) * 1984-07-23 1987-03-03 Ricoh Company Ltd. Apparatus for reading the image information of a colored original
US4647981A (en) * 1984-10-25 1987-03-03 Xerox Corporation Automatic white level control for a RIS
US4731661A (en) * 1984-11-16 1988-03-15 Sharp Kabushiki Kaisha Color document reader with white balance adjuster for determining light emission periods for a plurality of different-colored light sources and corresponding integration times for a light sensor by reading a white reference area
JPS62232255A (ja) * 1986-04-01 1987-10-12 Canon Inc 画像読み取り装置

Also Published As

Publication number Publication date
EP0273757A2 (de) 1988-07-06
CA1328011C (en) 1994-03-22
EP0273757A3 (en) 1988-10-05
US4845531A (en) 1989-07-04
DE3766697D1 (de) 1991-01-24
JPH054872B2 (de) 1993-01-21
JPS63166355A (ja) 1988-07-09

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